Why can't z6 send text messages?

Because the watch has not been upgraded or does not have this function at all, the solution is as follows:

1. First, in the mobile phone interface, click Little Genius, as shown in the figure below.

2. Enter the little genius interface and click More in the lower right corner, as shown below.

3. Then in more interfaces, click Info, as shown in the figure below.

4. Enter the information interface and click the Settings icon in the upper right corner, as shown in the figure below.

5. Finally, in the opened page, press the watch phone bill button, as shown in the figure below.